Abstract Simulated deck slab samples cast with six rebars, three in the top row and three on the second row, are being monitored after 19 years of exposure. The rebars are different corrosion resistant reinforcement: 2304, 304, 316, two clad rebars (316 with carbon steel core) and an alloy with 12% Cr. The samples were exposed outdoors to 15% NaCl by wt% for at least 10 years (weekly wet and dry cycles). The concrete cover over the first row in most samples was one inch (2.53 cm). A variety of geometry and rebar surface preparation took place. Rebar potential and electrochemical methods were used to characterize current conditions. Most rebars appear not to be corroding. A couple of samples, containing clad rebar type 2 (two rebars were attached to create a crevice and the rebar ends were not coated), show cracks on the concrete reservoir surface due to corrosion of the rebar carbon steel core. Samples with 12% Cr also show corrosion signs; in this case an artificial crack reduced the concrete cover and two rebars were attached to each other to create a crevice. There are a few other samples with rebars that have no cracks and appear to be corroding based on corrosion rates. The rebars in these samples were either pickled or wire brushed with a carbon steel metal brush (this likely caused small crevices).
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